What is the CSIS Trilateral Nuclear Dialog?

ACTING UNDER SECRETARY FOR ARMS CONTROL AND INTERNATIONAL SECURITY ROSE GOTTEMOELLER
Acting Under Secretary Gottemoeller participates in the CSIS Trilateral Nuclear Dialogue in London, England.

CSIS stands for Center of Strategic & International Studies.
http://csis.org/program/trilateral-dialogue-nuclear-issues

From their website:

Read "Toward an Appropriate Mix of Conventional, Nuclear, and Missile Defense Forces," the latest consensus statement from the trilateral working group.
August 24, 2011

While the United States, United Kingdom, and France often meet bilaterally with one another, they rarely meet in a trilateral forum, officially or unofficially, to discuss nuclear issues. In an effort to increase trilateral nuclear interaction, the Center for Strategic and International Studies (CSIS) established a group of high-level "Track 2" participants in 2009 to discuss nuclear issues and identify areas of consensus between the countries.

Each year, the CSIS Trilateral Dialogues meets in London, Paris, and Washington. Senior officials from all three governments also attend. The meetings are co-chaired by CSIS Senior Adviser Clark Murdock and Non-Resident Senior Adviser Franklin Miller. Kevin Kallmyer, Program Coordinator, provides general support to the project.

To help demonstrate the consensus developed across meetings, the CSIS Trilateral Nuclear Dialogues will periodically release consensus statements on important nuclear issues that are signed by all of the Track 2 participants in agreement with the paper. In 2009, the Dialogues produced a consensus statement on a common P3 approach on nuclear non-proliferation, energy use, disarmament and material security. In 2010, the group produced a statement on the role of P3 nuclear weapons in May and a statement about the role of nuclear weapons in NATO’s security in September 2010. In 2011, the Dialogue produced a statement on the “appropriate mix” of forces in NATO.